我是Javascript（纯粹的javascript）的新手，我正在努力创建一个聊天控制器应用程序来执行以下操作。
目前，我点击按钮后无法执行此帖子块。
以下是我的代码。
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1" />
<meta name="description" content="" />
<meta name="author" content="" />
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script
src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!--[if IE]>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<![endif]-->
<title>Bootstrap Chat Box Example</title>
<!-- BOOTSTRAP CORE STYLE CSS -->
<link href="assets/css/bootstrap.css" rel="stylesheet" />
<!-- FONT AWESOME CSS -->
<link href="assets/css/font-awesome.css" rel="stylesheet" />
<!-- CUSTOM STYLE CSS -->
<link href="assets/css/style.css" rel="stylesheet" />
<script type="text/javascript" src="assets/js/jquery.min.js"></script>
<script type="text/javascript">
// jQuery Document
$(document).keypress(function(e) {
if (e.which == 13) {
$("#submitmsg").click();
}
});
$(document).ready(function() {
$('#submitmsg').bind('click', function() {
var message = $('#usermsg').val();
$('#chatbox').append('<p>' + message + '</p>');
$('#usermsg').val('');
//alert(message);
});
});
function serverResponse(message) {
$('#chatbox').append('<p>Server: ' + message + '</p>');
}
$("#submitmsg")
.click(
function() {
alert("Hi");
var inputtedText = $("#usermsg").val();
var params = {};
var controllerUrl = 'https://westus.api.cognitive.microsoft.com/qnamaker/v1.0/knowledgebases/bde3c190-58bd-40d8-9ff1-c35eb18588be/generateAnswer';
$.ajax({
url : controllerUrl,
type : 'POST',
data : {
"question" : inputtedText
},
beforeSend : function(xhrObj) {
// Request headers
xhrObj.setRequestHeader(
"Ocp-Apim-Subscription-Key", "MyKey");
xhrObj.setRequestHeader('Content-Type',
'application/json; charset=UTF-8');
},
success : function(data) {
var dataObj = data;
alert('Data:' + JSON.stringify(dataObj));
$('#resultvalue').html(data);
serverResponse(JSON.stringify(dataObj));
alert(data);
}
});
});
</script>
</head>
<body>
<nav class="menu">
<div class="container-fluid">
<div class="navbar-header">
<div class="back">
<img src="acn.jpg" draggable="false" />
</div>
<div class="name">Accenture Compliance</div>
</div>
<ul class="nav navbar-nav navbar-right">
<li><a href="#"><span class="glyphicon glyphicon-user"></span>
User Name</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-out"></span>
Logout</a></li>
</ul>
</div>
</nav>
<br />
<br />
<br />
<div class="container">
<div class="row pad-top pad-bottom">
<div class="col-lg-3 col-md-3 col-sm-3">
<div class="chat-box-new-div">
<div class="chat-box-new-head">Compliance Avatar</div>
<div class="panel-body chat-box-new">
<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />
<br /> <br /> <br /> <br />
</div>
</div>
</div>
<div class=" col-lg-6 col-md-6 col-sm-6">
<div class="chat-box-div">
<div class="chat-box-head">
CHAT HISTORY
<div class="btn-group pull-right">
<button type="button" class="btn btn-info dropdown-toggle"
data-toggle="dropdown" aria-expanded="false">
<span class="fa fa-cogs"></span> <span class="sr-only">Toggle
Dropdown</span>
</button>
<ul class="dropdown-menu" role="menu">
</ul>
</div>
</div>
<div class="panel-body chat-box-main">
<div class="chat-box-left">Hello, Welcome!. You can ask me
questions on Compliance Policy ..</div>
<div class="chat-box-name-left">
<img src="compiler-bot-static.gif"
alt="bootstrap Chat box user image" class="img-circle" /> - Bot
</div>
<hr class="hr-clas" />
<div class="chat-box-right" id="chatbox"></div>
<div class="chat-box-name-right">
<img src="smiley.jpg" alt="bootstrap Chat box user image"
class="img-circle" /> - You
</div>
</div>
<div class="chat-box-footer">
<div class="input-group">
<input type="text" class="form-control"
placeholder="Enter Text Here..." id="usermsg"> <span
class="input-group-btn">
<button class="btn btn-info" type="button" id="submitmsg">SEND</button>
</span>
</div>
</div>
</div>
</div>
<div class="col-lg-3 col-md-3 col-sm-3">
<div class="chat-box-new-div">
<div class="chat-box-new-head">Frequently Asked Questions ..
</div>
<div class="panel-body chat-box-new">
<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />
<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />
<br /> <br /> <br />
</div>
</div>
</div>
</div>
<!-- USING SCRIPTS BELOW TO REDUCE THE LOAD TIME -->
<!-- CORE JQUERY SCRIPTS FILE -->
<script src="assets/js/jquery-1.11.1.js"></script>
<!-- CORE BOOTSTRAP SCRIPTS FILE -->
<script src="assets/js/bootstrap.js"></script>
</body>
</html>
为了检查函数是否实际被调用，我在("#submitmsg").click(function() {...内添加了一个警告，令我惊讶的是，它没有提醒任何事情，这意味着没有被调用。
请让我知道我哪里出错了，我该如何解决这个问题。
由于
答案 0 :(得分：1)
您的问题是由添加点击事件监听器的时间引起的。
在文档触发就绪事件之前，尚未加载DOM元素。
由于这个原因，js（jquery选择器）找不到＆＃34; submitmsg＆＃34;用于添加事件侦听器的元素
检查以下链接＆amp;代码
https://jsfiddle.net/f6fv1xvw/
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script type="text/javascript">
// maybe alerted [length = 0] because dom element loaded not yet
alert("before ready : " + $("#submitmsg").length);
$(document).ready(function() {
// maybe alerted [length = 1] because dom element loaded completly
alert("after ready : " + $("#submitmsg").length);
// need to add event listener this timing(after ready)
$("#submitmsg").click(function() {
alert("Hi");
});
});
</script>
然后再次检查你的源码为什么加载jquery 3次。
// called 1 time in head
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
// called 2 time before body
<script type="text/javascript" src="assets/js/jquery.min.js"></script>
// called 3 time in body
<script src="assets/js/jquery-1.11.1.js"></script>